<?php
/**
 * Created by PhpStorm.
 * User: 小灰灰
 * Date: 2020-03-10
 * Time: 11:47:10
 * Info: 退款
 */

/**
 * 使用方法：
 * $orderNo = '';                      //商户订单号（商户订单号与微信订单号二选一，至少填一个）
 * $wxOrderNo = '';                     //微信订单号（商户订单号与微信订单号二选一，至少填一个）
 * $totalFee = 0.01;                   //订单金额，单位:元
 * $refundFee = 0.01;                  //退款金额，单位:元
 * $refundNo = 'refund_'.uniqid();        //退款订单号(可随机生成)
 * $wxPay = new Refund($mchid,$appid,$apiKey);
 * $result = $wxPay->doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo,$orderNo);
 * if($result===true){
 * echo 'refund success';exit();
 * }
 * echo 'refund fail';
 */

namespace wxpay;

class Refund
{

    protected $mchid;

    protected $appid;

    protected $apiKey;

    public $data = null;

    public function __construct($mchid, $appid, $key)
    {
        $this->mchid  = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号
        $this->appid  = $appid; //微信支付申请对应的公众号的APPID
        $this->apiKey = $key;   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
    }

    /**
     * 退款
     *
     * @param float  $totalFee  订单金额 单位元
     * @param float  $refundFee 退款金额 单位元
     * @param string $refundNo  退款单号
     * @param string $wxOrderNo 微信订单号
     * @param string $orderNo   商户订单号
     *
     * @return string
     */
    public function doRefund($totalFee, $refundFee, $refundNo, $wxOrderNo = '', $orderNo = '')
    {
        $config          = array(
            'mch_id' => $this->mchid,
            'appid'  => $this->appid,
            'key'    => $this->apiKey,
        );
        $unified         = array(
            'appid'          => $config['appid'],
            'mch_id'         => $config['mch_id'],
            'nonce_str'      => self::createNonceStr(),
            'total_fee'      => intval($totalFee * 100),       //订单金额	 单位 转为分
            'refund_fee'     => intval($refundFee * 100),       //退款金额 单位 转为分
            'sign_type'      => 'MD5',           //签名类型 支持HMAC-SHA256和MD5，默认为MD5
            'transaction_id' => $wxOrderNo,               //微信订单号
            'out_trade_no'   => $orderNo,        //商户订单号
            'out_refund_no'  => $refundNo,        //商户退款单号
            'refund_desc'    => '商品已售完',     //退款原因（选填）
        );
        $unified['sign'] = self::getSign($unified, $config['key']);
        $responseXml     = $this->curlPost('https://api.mch.weixin.qq.com/secapi/pay/refund',
            self::arrayToXml($unified));
        $unifiedOrder    = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($unifiedOrder === false) {
            die('parse xml error');
        }
        if ($unifiedOrder->return_code != 'SUCCESS') {
            die($unifiedOrder->return_msg);
        }
        if ($unifiedOrder->result_code != 'SUCCESS') {
            die($unifiedOrder->err_code);
        }

        return true;
    }

    public static function curlGet($url = '', $options = array())
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        if ( ! empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);

        return $data;
    }

    public function curlPost($url = '', $postData = '', $options = array())
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if ( ! empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

        //第一种方法，cert 与 key 分别属于两个.pem文件
        //默认格式为PEM，可以注释
        curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLCERT, getcwd().'/cert/apiclient_cert.pem');
        //默认格式为PEM，可以注释
        curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLKEY, getcwd().'/cert/apiclient_key.pem');
        //第二种方式，两个文件合成一个.pem文件
        //        curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
        $data = curl_exec($ch);
        curl_close($ch);

        return $data;
    }

    public static function createNonceStr($length = 16)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $str   = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }

        return $str;
    }

    public static function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<".$key.">".$val."</".$key.">";
            } else {
                $xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml .= "</xml>";

        return $xml;
    }

    public static function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr          = strtoupper(md5($unSignParaString."&key=".$key));

        return $signStr;
    }

    protected static function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k."=".$v."&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }

        return $reqPar;
    }
}